[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] a delivery agent flag  A delivery agent flag  A records  A= delivery agent equate  accept( ) routine  accept_unqualified_senders feature  2nd  accept_unresolvable_domains feature  2nd  access database      enabling      finer control for under V8.10      hosts/domains and      recipients and  access_db feature  Adams, Rick  Address already in use error message  addresses     % character in      checking with check_compat      DECnet      error delivery agent and      host IP      looking up with DNS      masquerading  [See masquerading]     null (empty)      parsing      recipient  2nd      route addresses  2nd  3rd      sender's  [See sender's address]     separate BITNET      starting with |      stripping quotation marks from  2nd      transformation rules      undeliverable      X.400 standard  administration  [See system administration] Albitz, Paul  2nd  aliases file  2nd  3rd      in symbol table  2nd      updating  aliases/aliasing  2nd      AUTO_NIS_ALIASES compile-time macro and      old aliases, directory location problems and      preventing      rebuilding aliases database and      rebuilding aliases mode and      retired accounts and      sendmail options for      storing aliases as symbol table  2nd      testing aliases  2nd      turning off      user as LHS of      w class and  2nd  AliasFile (A) option  AliasFile option  allmasquerade feature  alternate queues  always_add_domain feature  ambiguous MX records  Apparently-From: header line  Apparently-To: header line  Append One Class to Another  APPENDDEF( ) Build directive  appending to files  2nd      . line (qf file)      ÷/.forward file and      control lines in qf files      SafeFileEnvironment option  appending to programs  [See programs, delivering to] AppleTalk network  ARBPTR_T compile-time macro  2nd  arg1= equate (syslog output)  arguments, command-line  [See command-line switches] argv[0]  arith database type  ARPAnet/Grey Book protocols  Assmann, Claus  AUTH, support for  AUTH= parameter  AUTH= SMTP extension  Authentication mechanism used  authinfo feature  Auto-Submitted: header line  AUTO_NIS_ALIASES compile-time macro  AutoRebuildAliases option